Lipid membranes for the biosensor applications

摘要

PCT No. PCT/EP93/00976 Sec. 371 Date Dec. 27, 1994 Sec. 102(e) Date Dec. 27, 1994 PCT Filed Apr. 21, 1993 PCT Pub. No. WO93/21528 PCT Pub. Date Oct. 28, 1993A bilayer lipid membrane (BLM) sensor comprising (1) a gold recording surface, (2) a first lipid layer which is an imperfect layer of a thiolipid which comprises the residue of two phospholipid molecules linked to each end of a disulphide (-S-S-) group, each through an oxyethylene (-O-CH2-CH2) chain which is short enough to allow the thiolipid to become anchored to the gold surface by self-assembly, but long enough to trap an aqueous layer between the gold surface and the bottom of the thiolipid layer, said thiolipid being attached to the gold surface and said imperfect layer being completed by a phospholipid which provides an unattached fluid phase at room temperature, and (3) a second lipid layer of phospholipid. The sensor is especially useful for measuring changes in electrical resistance and/or capacity when it is prepared to contain a receptor protein and an analyte containing an agonist to the receptor is contacted with the bilayer.!